Résumé : The STRONGkids is a nutritional screening tool for hospitalized children, which was found to predict a negative weight for height (WFH) standard deviation score (SDS) and a prolonged hospital length of stay (LOS) in a Dutch population of hospitalized children. This study aimed to test the ease of use and reproducibility of the STRONGkids, and to confirm its concurrent and prospective validity in a Belgian population of hospitalized children.